I searched for “NoCOMClassIdentified” and found a couple of references. I finally found one (I don’t have the link, alas) that helped me realize the problem was that I was running it from a PowerShell session that I’d opened as Administrator (for teh POWER!!!).

When I opened PowerShell as myself, I was able to complete the sequence to access the 60,000+ messages in my Inbox (did I mention we get a LOT of email here?), and use a quick pipe to Where-Object to extract just the emails I sent to myself: